About Speaker. Shrwan Krishna Shrestha. /
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1 PARTITION
2 About Speaker Shrwan Krishna Shrestha /
3 Topics to be covered Partition in earlier versions Table Partitioning Overview Benefits of Partitioned Table Challenges Planning of Table Partitioning How to Partition a Table Partition and Parallel Execution Query Performance Sliding Window Scenario Best Practices
4 Partition in earlier versions Till SQLServer 2000 only way to implement partition was to created a view UNIONed with multiple table.
5 Table Partition Overview Column based solution. Horizontal Partitions. This is a new feature that allows built-in data partitioning that handles the movement of data without physically moving it. It gives an advantage of having smaller objects to manage and maintain. A hidden computed column is created internally to represent the ID of a table or index partition for a specific row. To the users it looks like a table as we were always been using. But data are stored in different partitions not in one large table.
6 Partitioned Table
7 Dependencies
8 Benefits of Partitioning SQL Server automatically manages the placement of data in the proper partitions. A partitioned table and its indexes appear as a normal database table with indexes, even though the table might have numerous partitions. The table can be managed at the partition and filegroup level for ease of maintenance. Partitioned tables support easier and faster data loading, aging, and archiving. Application queries that are properly filtered on the partition column can perform better by making use of partition elimination and parallelism. In cases where partitioned data will not be modified, we can mark some or most of a partitioned table's filegroups as read-only, making management of the filegroups easier. In SQL Server 2008, compress can be done to individual partitions as well as control lock escalation at a partition level.
9 Challenges of Partitioning There is a maximum of 1,000 partitions for a table. You must manage filegroups and file placement if you place partitions on individual filegroups. The metadata-only operations (SWITCH, MERGE, and SPLIT) can be blocked by other DML actions on the table at the time, until a schema-modification lock can be obtained. Managing date or time-based data can be complex. You cannot rebuild a partitioned index with the ONLINE option set to ON, because the entire table will be locked during the rebuild. Automating changes to partitioned tables, as in a sliding window scenario, can be difficult.
10 Planning for Table Partitioning Decide which table can benefit from the increase manageability and availability. Plan on how to store the partitions in filegroups using a partition scheme. Specify the partition boundaries in a partition function.
11 How to partition a table Create additional filegroups if you want to spread the partition over multiple filegroups. Create a Partition Function Create a Partition Scheme Create the table using the Partition Scheme
12 Function CREATE PARTITION FUNCTION partition_function_name ( input_parameter_type ) AS RANGE [ LEFT RIGHT ] FOR VALUES ( [ boundary_value [,...n ] ] ) [ ; ] Left: The first value is the maximum value of the first partition. Right: The first value is the minimum value of the second partition.
13 Range Left & Right CREATE PARTITION FUNCTION myrangepf1 (int) AS RANGE LEFT FOR VALUES (1, 100, 1000); Partition Values col1 <= 1 col1 > 1 AND col1 <= 100 col1 > 100 AND col1 <= 1000 col1 > 1000 CREATE PARTITION FUNCTION myrangepf2 (int) AS RANGE RIGHT FOR VALUES (1, 100, 1000); Partition Values col1 < 1 col1 >= 1 AND col1 < 100 col1 >= 100 AND col1 < 1000 col1 >= 1000
14 Scheme CREATE PARTITION SCHEME partition_scheme_name AS PARTITION partition_function_name [ ALL ] TO ( { file_group_name [ PRIMARY ] } [,...n ] ) [ ; ]
15 Create Table CREATE TABLE [ database_name. [ schema_name ]. schema_name. ] table_name ( { <column_definition> <computed_column_definition> } [ <table_constraint> ] [,...n ] ) [ ON { partition_scheme_name ( partition_column_name ) filegroup "default" } ] [ { TEXTIMAGE_ON { filegroup "default" } ] [ ; ]
16 How to partition a table
17 Partition and Parallel Execution MAXDOP 'max worker threads Number of CPUs 32-bit computer 64-bit computer <= 4 processors processors processors processors
18 Parallel execution strategy
19 Query Performance It is a key benefit of table partitioning. Changes the way parallel and serial plans are represented. Enhances both compilation and run-time execution plans.
20 Query Performance Partitioned table allows partition aware seek operation. This is a key benefit of partitioning often called partition elimination or partition pruning.
21 Query Performance Execution plan includes skip scan: seek keys This is a second level of seek operation thataccessess the combination of conditions that can be satisfied by the index, in this case SalesOrderNumber = 'SO51922'
22 Sliding Window Scenario Load new data Remove old data
23 Sliding window scenario
24 Best Practice Make sure that the configuration of max degree of parallelism is set sufficiently high to take advantage of parallel operations, or else add a MAXDOP query hint to fine-tune the degree of parallelism. Maintain an empty partition on both ends of the partitioned table and ensure that only empty partitions are split and merged in a sliding window scenario. Remember that RANGE RIGHT may be more convenient than RANGE LEFT in partition functions, especially when you are specifying date ranges. Use data types without fractional components as partition columns, such as a date or an integer. Always use a standard language-independent date format when specifying partition function boundary values. Use an integer-based date and date dimension in data warehouses. Use a single column of the table as the partitioned column whenever possible. If you must partition across more than one column, you can use a persisted computed column as the partitioning column. But then to achieve partition elimination, you must control queries to ensure they reference the partition column in their filters. Ensure that queries against the partitioned tables have filters based on the partition column. Use SWITCH with MERGE to drop partition data: Switch out the partition and remove the partition's boundary value using MERGE. Use TRUNCATE TABLE to delete partition data by switching a partition out to a staging table and truncating the staging table. Check for partition elimination in query plans. Place read only data on read-only filegroups to reduce locking and simplify recovery for piecemeal restores. Spread filegroups across all disks for maximum I/O performance. Automate sliding window scenarios using available tools. When possible, use a server with enough main memory to fit frequently accessed partitions or all partitions in memory to reduce I/O cost. If the data you query will not fit in memory, compress the tables and indexes. This will reduce I/O cost. Use a server with fast processors and as many processor cores as you can afford, to take advantage of parallel query processing capability. Ensure the server has sufficient I/O controller bandwidth. Create a clustered index on every large partitioned table to take advantage of B-tree scanning optimizations.
25
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